What is your opinion about running AC submersible motor pump by Solar Energy using DC-AC inverter?

Working on one of my project on ground water extraction for small irrigation in one of the off grid areas, I found a party quoting us the solution of running AC motor via Solar Energy using inverter. I am still in search of a suitable answer, is It Workable Solution because of the huge efficiency losses?
The use of the AC motor buys you some benefit in that with the higher voltage, lower current (i.e. smaller wires, could be important for a long run- deep well) Additional calculations are needed to understand the losses by going with the inverter vs a dc motor. I am also assuming that battery power/storage will be employed for operation during night time/cloudy day functionality. This too needs to be considered. What I am saying is that solar inverter is a poor man's method to shaving costs. And don't look at the unit price, overall cost of ownership numbers need to be understood.

The nice thing about staying all in DC is that you do not need batteries not inverter nor anything really. The only reason you would need batteries would be to run when you do not get any sun. Remember that it is cheaper to store water than it is to store electricity.

In AC, your inverter will not kick in until you have a given voltage, and then it has a timer which prevents it from frying itself for going on and off too rapidly. So on days when you have lots of small clouds, it is a problem. Hence the almost indispensable need for batteries. They act like a buffer.

A couple of years ago I installed an off grid system and the owner had purchased a "solar pump" from Gozuk. I runs on ~30-250VDC and 90-240VAC so it must have a rectifier and smart controller built into the pump. I have run it off the 48V battery bank, but in the end have left it connected to the output of the 220V inverter. Total lift is ~400 feet to the water storage tank.

Actually if you use a solar motor controller, you can go DC-AC without using the classic inverter. Power production is not watt driven but frequency driven, as the sun goes up the motor picks up speed. Several advantages here, AC motors are cheaper, you don't have to pull an existing motor out the hole to replace. We are capable of driving a 10-hp motor with a single controller (including 3-P 480-v), no batteries are needed, complete off grid solution.

But now there is a small problem i think that the submersible pump have to be special pump that can run with different speeds because of the pump cooling, i mean the non solar submersible pump that run with constant could be cooled by water , but the solar submersible pump how could be cooled

- - - -> by: mohamad hagag

Post a Comment:

Plz Calculate (8 - 3) =

(Your comment will show after approved.)

You may also like:

Ground mounted Solar PV Return On Equity
Energy supplied to grid can be allowed with a 3 to 5% escalation for a O & M cost recovery and sustainability as the Salaries and project overheads will be affected with Inflation.Normal ...
1kW solar panel produced electricity on a sunny day
It depends on the solar radiation on the location at the time of the year. Notably, the latitude of the location and there is a way to calculate the available solar radiation for the sunny clear day. ...
Indian choice for energy is solar plant (Part 2)
Note that 80% of solar generation in Germany is from Rooftop plants. India should take advantage of number of residences/commercial buildings in the country. Provide a conducive atmosphere for the ...
Differences between String inverter and Central inverter
Using string inverters instead of central inverters for big power plants is a totally different concept, that affects to the whole management of the PV plant in some aspects:Designing: with ...
Hype and overselling in solar industry
In the solar industry, there are few if any risk-lowering product intangibles and the compelling "mainstream" application hasn't been identified yet. So when the cost of solar reaches grid parity, ...